Apparatus for leveling the ends of tools.



% Fig.2. 1

A. BATES. APPARATUS FOR LEVBLING THE ENDS 0F TOOLS. APPLICATION FILED 00T.8, 1913.

Lmwm Patented Feb. 23, 1915.

APPARATUS roe LEVELI ASSIGNOR T UNITED SHOE MACHINERY Y, A .oonronarron or new mnsnr. no THE ENDS or TOOLS.

I To all whom it may concern Be it known that I, ARTHUR BATES, a subject of the King Leicester, Leicestershire, England, have invented certain Improvements in Apparatus for Leveling the Ends of Tools, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the draw ings indicating like parts in the several figures. p

The present invention relates to improvements in apparatus for leveling the ends of punches and similar tools by controlling the relative movement between the latter and an abrasive member, and it is of particular advantage when a gang or plurality of punches are adapted to be operated upon simultaneously.

It has been found in the past that there is considerable didiculty when renovating a tool, as for instance a perforating punch which cuts against a'hard steel surface. in the tool with a level operative face and with this face in correct angular rela finishing tionship to the tool shank. Moreover, it frequently happens that more of the tool is ground away by the abrasive member than is necessary. This applies particularly to the renovation of a gang or plurality of punches, drivers or similar tools that are adapted to operate simultaneously upon'the in rigidrelationship to one another, for in this case, not only must each tool face be level and be in correct angular relationship to its sha but all of the said faces must lie in a single plane. If the tools are renovated individually a great deal of time is required, and more time is lost in lG-lIlSGIiilIlfI the tools in their holding block by reason of the fact that each tool must be adjusted individually to bring it into correct position relatively the gang.

llt is therefore inven to the other tools of consists of the the class described of an abrasive member,

of England, residing at abut against provision in an apparatus of Specification of Letters Patent. 'Pathem mfl Fgb 23, 1915 Application filed October 8, 1918. Serial No. 784,145. g I

a holder for maintaining a tool in contact therewith and means for giving said tool a combined reciprocatory and rotatory move ment across the said member. p

t is preferred to construct the apparatus so that gang punch ground so that inclined to the axis of the shank of the block is obviated, by reason of the peculiar relative movement between the abrasive member and the punches.

In the apparatus the holding device is carried by a'camiage mounted for tory movement over the abrasive member and is slidable in the carriage toward and from the said member so that the ends of the punches can bearupcn the. latter, and

the shape of the holding device is such that it can be withdrawn order to facilitate punches.

These and other features of the invention will be described in connection with an illustrative apparatus and pointed outin the appended claims.

- Referring now to the accompanying drawings :Figure 1 is a perspective of an apparatus embodying the various features of the invention, and Fig. 2 is a central transverse section of the apparatus shown in Fig. 1.

The apparatus comprises a narrow rectangular base plate 1 provided at each end with two upstanding lugs 3; and each pair of lugs supports one of two guide rods 5 ar ranged parallel to each other. Below the guide rods, pwardly projecting ledges 7 extend along the base plate 1, and throng these ledges are threaded screws 9 which an abrasive member such as an oilstone 11 resting on alevel table formed upon the middle portion of the base plate. The screws 9 hold the oilstone 11 in adjust from the apparatus in the changing of the reciprocaed position and permit stones of various sizes to be used.

, A carriage 13 is mounted for lengthwise movement on the guide rods 5, being retained thereon by bosses which are formed on the carriage and which encircle the rods. In a circular socket 15 upon the carriage 13 a bearing is formed for a vertically movable cylindrical holding device or plunger 17 which is normally kept in its lowest position. in. the carriage 13 by its weight. The plunger 17 is bored to receive at its lower end. the tubular shank 18 of a detachable block 19 to which are secured the punches 21 which are to be operated upon. This block. 1 9 has a flange as shown which limits its movement into the bore of the plunger I 17, and one end of. a spring 23 is fixed inside the plunger and the other end bears against the inner Wall of the tubular shank 1-8. of the block 19. to prevent the latter from moving outwardly or axially of the plunger 17. This. allows various sets of punches to be quickly inserted in. or removed from the apparatus.

To and fro movement isgiven to the carriage 13- to draw the punches lengthwise of the oi-lstone 11, and means are herein provided to rotate the plunger 17 and consequently the punches 21 during this lengthwise movement. Accordingly, around the lower end of the plunger 17 are cut grooves in order to form gear teeth 25 which mesh with teeth on a rack bar 29 arranged parallel tothe rods 5 and passing through a recess in the under side of the carriage, the rack bar being supported at either end by one of the lugs 3. To prevent the carriage 13, in its reciprocatory movement, knocking violently against the lugs 3 spiral springs 31 encircle the ends of the guide rods 5 for preventing contact between the carriage and the lugs.

The punches are drawn backward and forward over the oilstone 11 by means of a handle. 33 with which the upper end of the,

plunger 17 is provided; The stem 35 of the'handle enters the bore in the plunger and is maintained therein by means of a pin 37 passing through. the plunger and promotinginto a groove 39- extending around the. said stem. This pin-and-groove connection enables the handle to rotate freely with. relation tothe plunger. The weight of the plunger'and the handle onit may be. such as to exert the whole or a fraction of the pressure. required betweenthe punches and the oilstone.

In the. operation of the machine the Workman, grasps the handle 3.3 and moves it alternately 1n opposite. directions to reciprocate the carriage 13 on its guide rods and draw the gang of punches along the length but without affecting the handle, which does not turnin. the Workmans hand by reason of the pin-and-groove connection between it and the plunger. In this way the lower ends of the punches may be accurately leveled to bring all their punching surfaces into one plane, and the liability of this plane being inclined to the axis of the shank of the detachable block is obviated.

In order to promote brevity and clearncss the illustrative apparatus has been shown as adapted for usewith a detachable block and hollow punches such as used in the perforating machine described in U. S. patent to Flynt No. 94.1,704c, but it should be understood that the invention is not limited in the scope of its application to the particular apparatus shown and described.

Having thus described myinvention, what I claim-as new and desire to secure by Letters Patent of the United States is:

1. An apparatus of the class described, having in combination, an abrasive member, a. holder for maintaining a tool in contact therewith and with the axis of said tool perpendicular to the horizontal face of said abrasive member, and means for giving said tool through said holder a combined reciprocatory and rotatory movement across said abrasive member.

2. An apparatus of the class described having, in combination, an abrasive member, a slide bearing located in proximity to said member,a carriage slidable on said bearing, a tool holder having its axis perpendicular to the operative face of said abrasive member and rotatably mounted in said carriage, and means whereby reciprocation of said carriage rotates said tool holder.

3. An apparatus of the class described, having in combination, an abrasive member, guides arranged in proximity to said member in a plane parallel to the abrasive surface thereof, a carriage reciprocable on said guides,said carriage being provided with a socket, a punch holder removably held insaid socket, a stationary rack, and gearing connecting said rack with said holder.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

V ARTHUR BATES.

Witnesses:

FREDERICK WILLIAM WORTH, Q BASIL POMEROY Coal- R, 

